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QL40A DTH Hammer
QL series · without foot valve · hole range Φ110-135 mm
Product description
The QL series is known for low pressure and high air volume, with a large piston area and high impact energy per blow — ideal for large-diameter water wells and bench blasting, efficient already at 1.0–1.7 MPa.
A DTH hammer is a piston-type air tool: compressed air enters through the top sub, opens the check valve and is routed by the valve seat to drive the piston back and forth in the inner cylinder; the piston strikes the bit shank and the energy breaks the rock. Exhaust leaves through ports in the piston case, and flushing air carries cuttings out of the hole. The drive chuck transmits rotation, while the stop ring and guided sleeve keep the piston stroke and alignment.
Selection guide: OD Φ99 mm, hole range Φ110-135 mm, thread API2 3/8″REG, matched with QL40A bits; recommended working pressure 1.0–2.2 MPa, air consumption 5 / 9 m³/min. Use the upper pressure in hard rock and reduce it in wet formations to avoid regrinding cuttings.
Suitable for water wells, bench blasting, quarries, geothermal drilling and foundation anchoring in medium-hard to hard rock. Bits, subs and packaging can be customized to drawing or sample; standard models are in stock and bulk lead times are confirmed on order.
Technical parameters
Whole-unit parameters | air consumption at 1.0 / 1.5 MPa
| Model | QL40A |
| Type | without foot valve |
| Outer Ø | Φ99 mm |
| Hole Range | Φ110-135 mm |
| Length (less bit) | 1057 mm |
| Weight | 42.7 kg |
| Thread | API2 3/8″REG |
| Bit shank | QL40A |
| Air pressure | 1.0–2.2 MPa |
| Air consumption (1.0 / 1.5 MPa) | 5 / 9 m³/min |
